Rotary blower.



No. 814,190. PATENTED MAR. 6, 1906 G. C. DAVIS.

ROTARY BLOWER.

APPLICATION TILED MAY 2, 1905.

m1"? 7 J A (2C9. WM,- MM g CLARENUE C. DAVIS,

oiianALF TO WILLIAM HALKYARD,

ISLAND.

ROTARY BLOWER the accompanying drawings.

This invention relates to im rovements in steam-actuated blowers for pro u'cing a forced draft in boil rs, and has for its object the pro-' duction of ower constructed on the principle of a To ary fan to which motion is imparted by the action of. steam dischar ed .a ainst the air from radial pipes connects to t e rotary hub. v

In the ordinary steam-actuatedian-blower the steam is discharged from the arms sup:

porting the ian-bla'desfand when thus discharged has had a tendency to strike against the adjacent fan-blade, and by the reaction this caused the efficiency of the blower is gllgeatly reduced. In my im roved device t estcam is received through t of the device and led through radially-dis posed I center ub,'said pipes being substantially the ipes that extend outward fromthe length of the i an blades. Extending 'iorward from the outer end of each of these pipes is a perforatedheadthat dischar es the steam against theair free and clear of t e fan-blades "and approximately-at right on which the same turns. By carrying the steam out so far from'the center a great levera 'e'is obtained, and, by discharging the same c ear of the fan there is no reaction on the adjacent blades, and a tremendousvelocity to the fan is thus obtained, rendering the device highly efficient.

Another feature of the invention is'that by discharging the steam forward ofthe fan all the moisture of the steam is mixed with the current of air to thus increase the efficiency ,6! the blower.

The invention is fully set forth in this specification and more particularly pointed out'in the ap ended claims.

In t e accompanying drawings, Figure 1 illustrates a portion of a boiler, partly in s'ec tion, withm ydraft apparatus attached thereto. showing the fan-blades and the alternate radial steam-supplying arms. Fig; 3 an on- Speeiflcation of Letters Patent. Application and Kay 2, 1-905. l Sm-hi1 1t- 253,41

be bolted to the boiler. fihefiaring ehollow shaft nested" to t e steam-Suppl angles to the axis and has two outlet-ports at Fig.2 1s a front elevation of the device,

or NORTH KING TON. anon Pilicnheii mar-en less;

larged sectional view of the and'the .lar steam-supplying shaft Fig., -4 shows} detail view of the construction ,oionebf'the' heads from which the steamxi's discharged and the tube supplyingthe same, also shewing one of the fan-bladesbeyond illustrating the relation of the headto said lads;

ing the annular stea -chamber fromwhich steam is supplied to t e radialarrns i Referrin to the drawings, at iis the boiler,; which is SilOWIl as having the brickwork partly broken away, and-at '2 is the casin in which the fan is rotatably mounted. T" a casing may be constructed of any material and in an suitable form. I have'shown the same me e in two parts, so as tofrender the working parts of the blower more accessible.

' mouthseotion 4 may be made in another section, with its flange 5 bolted to the flange 3 ofthe casin In thisconstruction the bearing 6 wool be suspended in the center by aseries of arms-r 7..

At as the hollowshaft, than the Steg: 5 is a secticnalview on line5 5 of ,3, show- The easing-body 2 has a 'flangeii, that'rnay tionary in the bearing 6. Thistshaft is thread.-

ed at its inner end12 to receive the'two checke a t nuts 9 9 and on its outer end to lfeoif union '10, b which union as, h

shaft is hollow at '13 for-a port on of its the steam into the an .s, 1 t a m iflarphamheriw in the rotatable hubi'o. .Thisihub i5 salsa revolve on the shaft 8, :it msyesn:

structed in any suitable reenter. TQItji's Shbwn as being made of an outer ring or shell T7 with two short bushing-tin s or 1818, held-in place within said- 1919, leaving a space" betweent my e' e the steaxn chamber 15.

At 20"is a collar that isattached to the shaft. 8 b a set-screwor other'convehient means. ceive' the end 'of the' rotatablehub' lfi' and serves primarily as a nation-washe agafihst which the said hub mayrotate; This coil also has an annular Chamber 22 to serve oil-reservoir that issupplicd throughthefe' d-f aid collar is-countcrbored torej of any suitable material and supported from the hub 16 in any suitable manner. They may be mounted on tubular arms that serve as the steam assage-ways, or the sup orting-rods may e solid, as shown in the rawings.

An essential feature of my invention is the manner in which I discharge the steam forward of the fan-blades and free and clear of the same. This is done through the pipes 26 26, which extend out radially from the hub 16. On the end of each of these radial pipes is secured a head 27, set at right angles to the same. The hollow portion 28 in this'head extends forward clear of the fan-blades and is'threaded on its end. An adjustable cap 29 is screwed onto this threaded ortion against a regulating check-nut 30. T is ca is rovided with one or more holes 31 ,throug W 'ch the steam is discharged. The opposite end of this head has a weighted extension 32 to serve as a counterbalance for the extendin tubular end and cap. This counterba ance is found in practice to be quite necessary in order to ewpalize the strain of the centrifugal force on t e extending endtand cap.

7 The tubular portion 28 maybe eictended a little farther than is shown in the drawings and have its end plugged, and then by dri in discharge-openings 31 into the side of this tu e the necessity of using cap 29 may be done away with.

Theeonstruction and operation of my im- 7 proved device may be more fully described as follows: The tube or shell 2 may be at tached to the ash-pit door, set on either side of the same in the front of the boiler, or inserted through the wall at the side and held in place b an suitable means. By constructing t e s ell in two parts it may be readily separated, thereb working parts very accessi 1c. The steampipe 11 may be led from the boiler to the center shaft in any suitable manner and suitable shut-oil valves employed to control the flow of steam tothe device. The central tubular shaftS is held stationary in the bearin 6, and the hub 16 is held to rotate between t e friction-washer 20 and the nuts 9 9. These nuts ma be nicely adjusted to take upan latera motion of the hub on the shaft. =pluralit of fan-blades 25 are supported from this ub'in any suitable manneij'and steampassagesi'n the form of ipes 26 are preferably arranged to exten from the hub and alternate with the fan-blades to conduct the steam to the dischar e-outlets 31, which outlets are arranged to irect the steam at ri ht angles to the axis of rotation and preferably dischargethe same forward of the fan-blades. The steam under pressure thus discharged rotates the fan-blades with a tremendous velocity, carrying a large quantity of airin which the steam is mingled and forces the same with a great pressure through the'tightlyrendering the packed fuel on the grate, materially increasing the combustion of the same, and conseqliliently the e'iliciency of the boiler. By disc arging the steam from outlets located so far from the center of rotation a reat leverage is obtained to do the work wit the use of but a very small quantity of steam.

In the construction above described I obtain a very owepful draft with but little expenditure 0 power, and the cost of operating is reduced to the minimum.

The device is very efficient, as Well as simple and practical in construction.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A rotary blower comprising a rotatable hub, means for supplying said hub with steam, a plurality 0 blades supported from said hub, and-a plurality of steam-conductors su ported b said hub the outer end of each 0 said con uctors being rovided with an extension projecting lateral 'y beyond the plane of the ed es 'of said blades, whereby the steam is disc arged at a point clear of the fan-blades.

2. A rotary blower comprising a rotatable hub, means for sup lying steam thereto, a

lurality of fan-bladbs supported from said liub, and a plurality of steam-conductors alternatin with and inde endent of the fanblades an also supporte by said hub, each of said conductors bein provided with a discharge end projecting laterally beyond the plane of the ed es of said blades, whereby the steam is discharged at a point clear of the fan-blades.

, 8. A rotary blower comprising a rotatable hub, means for supplying steam thereto, a lurality of fau-bla es supported from said ub, and a plurality of radiallyarranged steam-conductors connected to said hub and alternating with said fan-blades, said conductors being each (provided with a right-angular discharge en projecting laterally beyond the lane of the edges of said blades, whereb t e steam is discharged at a point clear 0 I the fan-blades.

4. A rotary blower comprising a rotatable hub, means for supplying steam thereto, a

lurality of fan-bla es supported from said hub, and a plurality of steam-conductors alternating with said fan-blades, said conductors being of approximately the same length as said blades and each rovided with an extension projecting lateral y beyond the plane ofthe ed es of said blades, whereby the steam is disc arged at a point clear of the fan-blades.

5, A rotary' blower comprising a rotatable hub, means for supplying steam thereto, a lurality of fan-bla es supported from said liub and a plurality of steam-conductors extending. outwardly from said hub, the outer free ends of said conductors being weighted and provided with extensions 'proieqtinf lat- 7 extension, and an ajustable cap secured to erally beyond the plane oi the edges 0 said the free end of e'achextension and pmvidsd blades. v with holes 01' periorations.

6. A rotary blowr comprising a retatizbiki 1111 testimeny whereof I aflix my signature 5 1111b, 1121833? 501" gllipvlying, stegm:1 ttrwl'fito, g; in presence of two Witnesses.

ura 't 0 an- :1 es su orte 0m semiv ub', a p urality of steaLm-cfifiductors aisopar OLAREN CE DAVIS ried by said h b andaiternating with said v Witnesses: fan-biades, the outer free ends of said 0011- HOWARD E. BARLOW,

' 1o ductors being each provided with a. Lateral A C. E. CAMPBELL. 

